.ico { background-image: url(../static/images/sprite.png) }
.ico-down { width: 1024px; height: 1024px; background-position: 0px 0px; }
.ico-left { width: 1024px; height: 1024px; background-position: -1024px 0px; }
.ico-save { width: 1024px; height: 1024px; background-position: 0px -1024px; }
.ico-up { width: 1024px; height: 1024px; background-position: -1024px -1024px; }